[ClusterLabs] how to set a dedicated fence delay for a stonith agent ?

Lentes, Bernd bernd.lentes at helmholtz-muenchen.de
Mon May 8 15:20:02 EDT 2017


i remember that digimer often campaigns for a fence delay in a 2-node  cluster.
E.g. here: http://oss.clusterlabs.org/pipermail/pacemaker/2013-July/019228.html
In my eyes it makes sense, so i try to establish that. I have two HP servers, each with an ILO card.
I have to use the stonith:external/ipmi agent, the stonith:external/riloe refused to work.

But i don't have a delay parameter there.
crm ra info stonith:external/ipmi:

pcmk_delay_max (time, [0s]): Enable random delay for stonith actions and specify the maximum of random delay
    This prevents double fencing when using slow devices such as sbd.
    Use this to enable random delay for stonith actions and specify the maximum of random delay.

This is the only delay parameter i can use. But a random delay does not seem to be a reliable solution.

The stonith:ipmilan agent also provides just a random delay. Same with the riloe agent.

How did anyone solve this problem ?

Or do i have to edit the RA (I will get practice in that :-))?


Bernd Lentes 

institute of developmental genetics 
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HelmholtzZentrum München 
bernd.lentes at helmholtz-muenchen.de 
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fax: +49 (0)89 3187 2294 

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